Diaphragm for submarine signal transmitters



W. KUNZE. DIAPHRAGM FOR SUBMABINE SIGNAL TRANSMITTERS- FILED JULY 19. 1920.

1 Feb. 27, 1923. 1,446,569;

Fig.1. Fig.2.

' .Invenhn Dr. Wily Kanze Patented Feb. 27, 1923 v UNITED STATES WILLY KUNZE, OF BREMEN, GERMANY.

DIAPHRAGM FOR SUBMARINE SIGNAL TRANSMITTERS.

Application filed July 19, 1920.

To all whom it may concern:

Be it known that I, Dr. VILLY KUNZE, a citizen of the German Republic, and a resident of Bremen, Germany, have invented certain new and useful Improvements in Diaphragms for Submarine Signal Transmitters (for which an application has been filed in Germany on July 20. 1918, by the firm Atlas Verke A. (in, of Bremen, Germany, with my knowledge and consent), of

which the following is a specification.

It is usual, to arrange on board of ships the submarine signal transmitters within special. chambers, which are filled with water. In submarine boats these transn'iittors are arranged within the front flooding tanks. As however the transmitter diaphragms usually have a diameter exceeding half of a meter, the arrangement resulted in extraordinary difiiculties and accordingly it is an urgent requirement, to keep the diameter of these diaphragms as small as possible. The transmitter casing proper mostly has a smaller diameter than the diaphragm itself. On the other hand at a given or required amount of the sound energy, delivered to the water, and of the sound softening, it will not be advisable to diminish the diameter of the diaphragm below a certain limit, without straining the material too much. As for signaling relatively high sounds are employed, overtones of the diaphragm are utilized for the timing of the oscillatingsystem. 'lherehy in the diaphragm node circles are formed, in which the oscillating or swinging amplitude is zero.

According to the invention the rim zone of the diaphragm is bent off inwardly in such a manner, that the circle, in which the diaphragm secured to the casing, has a smaller diameter than the diaphragm itself. It will be advisable in this connection to choose the point at which the diaphragm shall be bent in conformity to a. node circle. By this arrangement the diameter of the diaphragm substantially diminished. without that the oscillating or swinging relations are materially changed. As the bending of the diaphragm would cause difficulties. in practice the desired shape is given to the diaphragm already while casting or turning the same.

Serial No. 397,546.

In the accompanying drawing, illustrating the subject matter of my invention in a diagrammatical manner,

Fig. 1 shows the diaphragm in use until now, the shape of the same being thus selected, that a system of swinging or oscillating as represented by the dotted lines, is produced.

A and A are points of the node circle. For the purpose of securing the diaphragm the flange F of the casing G is employed. The force acts in the direction of the arrows.

In Fig. 2 the diaphragm is bent off at A and A, according to the principle of the invention and the diameter of the diaphragm is thereby reduced for about one third of the previous diameter.

According to the present invention the diaphragm consists of a substantial fiat plate and an inward flange which serves to secure the diaphragm to the body of the transmitter by means of bolts and the like. Plate and inward bent flange may be two separate members but preferably both parts will constitute one single piece of cast or turned iron, steel or bronze. This construction allows the diameter of the fastening periphery to be much smaller than the outer diameter the diaphragm and using the inward bent flange for helping to produce the sound. This effect is more particularly obtained if? the inward bent flange begins in the neighborhood of the node circle of the overtonc of the diaphragm.

The transmitter G to be used in connection with the diaphragm may be that of the normal electrical type comprising means oscillating by the elfect of an alternating current. These oscillations of the members of the transmitter act by means of a rod upon the centre of the plate which for this purpose shows here a small enlargement as indicated by the drawing.

Having thus particularly described the nature of my invention, what I claim as new and. desire to secure by Letters Patent of the United States is:

1. Diaphragm for submarine signal transmitters comprising a substantial flat plate and an inward bent flange, the inward periphery of said flange being of smaller diameter than the outer diameter of the plate and en memes serving for securing the diaphragm to the comprising a flat plate and an inward. bent transmitter body. flange, said flange beginning at the point 2. Diaphragm for submarine signal tians- Where a node point would be, if the dinl0 init ieis comprising a substantial flat plate 'phragni would be stretched out fiat. and an inward bent flange, both members In testimony whereof I affix my signabeing made in one piece. ture.

3. Diaphragm for submarine transmitters 7 DR. WILLY KUNZE. 

